Since we are asked to find the ratio between 2m and 1d, I would find them in function of o so that it simplifies and we remain with our ratio. Thus, d=30/12o=15/6o and m=4o so that 2m=8o.Then the ratio becomes 8o/(15/6)o = 8*6/15 = 8*2/5 = 16/5!